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Magnetic resonance imaging of the third molars: developing a protocol suitable for age estimation

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Organization
Abstract
Purpose: To develop a clinically feasible MRI protocol – using standard commercial 3T MR hardware – to visualize all four third molars for age estimation, with particular attention to distinguishing the highest developmental stages. Materials and methods: In vivo scans of eight volunteers aged 17 – 24 years and ex vivo scans of porcine jaws were performed to make a stepwise selection of adequate sequences. A bilateral four-channel flexible surface head coil was used. The maximum acceptable acquisition time was set at seven minutes. Two observers evaluated the suitability of the images. Results: T2-weighted images were preferred to T1-weighted images. To clearly distinguish root apices in (almost) fully developed third molars a spatial resolution of 0.30 x 0.30 mm² was necessary. Within the limited acquisition time only a TSE T2 sequence generated images with sufficient resolution. Thin slice TSE T2 and TSE 3D T2 sequences could not generate the desired resolution. A UTE sequence was tried, but could not be completed in vivo by the used hardware. Conclusion: Three Tesla MRI of the third molars is a feasible technique for age estimation, in which a TSE T2 sequence can provide the desired spatial resolution within a clinically acceptable acquisition time.
Keywords
magnetic resonance imaging, surface head coil, age estimation, third molars, adolescent, young adult

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MLA
De Tobel, Jannick, Elke Hillewig, Stephanie Bogaert, et al. “Magnetic Resonance Imaging of the Third Molars: Developing a Protocol Suitable for Age Estimation.” Arbeitsgemeinschaft Für Forensische Altersdiagnostik, 18. Treffen, Referaten. Arbeitsgemeinschaft für Forensische Altersdiagnostik (AGFAD), 2015. Print.
APA
De Tobel, J., Hillewig, E., Bogaert, S., Deblaere, K., & Verstraete, K. (2015). Magnetic resonance imaging of the third molars: developing a protocol suitable for age estimation. Arbeitsgemeinschaft für Forensische Altersdiagnostik, 18. Treffen, Referaten. Presented at the 18. Treffen der Arbeitsgemeinschaft für Forensische Altersdiagnostik, Arbeitsgemeinschaft für Forensische Altersdiagnostik (AGFAD).
Chicago author-date
De Tobel, Jannick, Elke Hillewig, Stephanie Bogaert, Karel Deblaere, and Koenraad Verstraete. 2015. “Magnetic Resonance Imaging of the Third Molars: Developing a Protocol Suitable for Age Estimation.” In Arbeitsgemeinschaft Für Forensische Altersdiagnostik, 18. Treffen, Referaten. Arbeitsgemeinschaft für Forensische Altersdiagnostik (AGFAD).
Chicago author-date (all authors)
De Tobel, Jannick, Elke Hillewig, Stephanie Bogaert, Karel Deblaere, and Koenraad Verstraete. 2015. “Magnetic Resonance Imaging of the Third Molars: Developing a Protocol Suitable for Age Estimation.” In Arbeitsgemeinschaft Für Forensische Altersdiagnostik, 18. Treffen, Referaten. Arbeitsgemeinschaft für Forensische Altersdiagnostik (AGFAD).
Vancouver
1.
De Tobel J, Hillewig E, Bogaert S, Deblaere K, Verstraete K. Magnetic resonance imaging of the third molars: developing a protocol suitable for age estimation. Arbeitsgemeinschaft für Forensische Altersdiagnostik, 18. Treffen, Referaten. Arbeitsgemeinschaft für Forensische Altersdiagnostik (AGFAD); 2015.
IEEE
[1]
J. De Tobel, E. Hillewig, S. Bogaert, K. Deblaere, and K. Verstraete, “Magnetic resonance imaging of the third molars: developing a protocol suitable for age estimation,” in Arbeitsgemeinschaft für Forensische Altersdiagnostik, 18. Treffen, Referaten, Berlin, Germany, 2015.
@inproceedings{6837786,
  abstract     = {Purpose: To develop a clinically feasible MRI protocol – using standard commercial 3T MR hardware – to visualize all four third molars for age estimation, with particular attention to distinguishing the highest developmental stages.
Materials and methods: In vivo scans of eight volunteers aged 17 – 24 years and ex vivo scans of porcine jaws were performed to make a stepwise selection of adequate sequences. A bilateral four-channel flexible surface head coil was used. The maximum acceptable acquisition time was set at seven minutes. Two observers evaluated the suitability of the images.
Results: T2-weighted images were preferred to T1-weighted images. To clearly distinguish root apices in (almost) fully developed third molars a spatial resolution of 0.30 x 0.30 mm² was necessary. Within the limited acquisition time only a TSE T2 sequence generated images with sufficient resolution. Thin slice TSE T2 and TSE 3D T2 sequences could not generate the desired resolution. A UTE sequence was tried, but could not be completed in vivo by the used hardware.
Conclusion: Three Tesla MRI of the third molars is a feasible technique for age estimation, in which a TSE T2 sequence can provide the desired spatial resolution within a clinically acceptable acquisition time.},
  author       = {De Tobel, Jannick and Hillewig, Elke and Bogaert, Stephanie and Deblaere, Karel and Verstraete, Koenraad},
  booktitle    = {Arbeitsgemeinschaft für Forensische Altersdiagnostik, 18. Treffen, Referaten},
  keywords     = {magnetic resonance imaging,surface head coil,age estimation,third molars,adolescent,young adult},
  language     = {eng},
  location     = {Berlin, Germany},
  publisher    = {Arbeitsgemeinschaft für Forensische Altersdiagnostik (AGFAD)},
  title        = {Magnetic resonance imaging of the third molars: developing a protocol suitable for age estimation},
  year         = {2015},
}